Question 1: Define noble gases and list all elements classified as noble gases in Group 0.

Answer: Noble gases are inert, colorless, and odorless gases in Group 0 of the periodic table; they include Helium, Neon, Argon, Krypton, Xenon, and Radon.

Question 2: Explain why noble gases are generally unreactive.

Answer: Noble gases are unreactive because they have a full outer electron shell, making them stable and unlikely to gain or lose electrons.

Question 1: Describe how the atomic number of noble gases changes across Group 0 and how this affects their physical properties.

Answer: The atomic number increases from Helium to Radon; as it increases, noble gases become denser, have higher boiling points, and larger atomic sizes.

Question 2: Which noble gas has the lowest boiling point, and why?

Answer: Helium has the lowest boiling point because it is the smallest noble gas with weak intermolecular forces.

Question 1: Calculate the molar volume of 2 moles of Argon gas at standard temperature and pressure (STP). (Use 22.4 L/mol for molar volume at STP.)

Answer: 44.8 liters

Question 1: Describe a safe method to collect a sample of neon gas in a laboratory setting.

Answer: Use a sealed container connected to a discharge tube where neon is produced, ensuring proper ventilation and avoiding leaks or inhalation of gas.

Question 2: Identify two safety precautions that should be taken when handling radon in a laboratory.

Answer: Radon is radioactive; precautions include using proper ventilation, wearing protective equipment, and handling in a fume hood to prevent inhalation.

Question 1: A sample of xenon gas is heated from 20°C to 80°C at constant pressure. Describe what happens to its volume and explain why.

Answer: The volume of xenon gas increases because heating causes the gas particles to move faster and collide more forcefully, increasing the volume according to Charles's law.

Question 1: Explain why helium is used in filling balloons and airships instead of other noble gases.

Answer: Helium is used because it is the lightest noble gas, non-flammable, and has a low density, making it ideal for lifting.

Question 2: Identify one medical application of radon and discuss its safety considerations.

Answer: Radon is used in some cancer treatments; however, due to its radioactivity, strict safety measures are necessary to protect patients and staff from radiation exposure.